SU1638479A1 - Dryer - Google Patents

Abstract

The invention relates to a drying technique, can be used in the chemical, metallurgical and other industries of the industry for the heat treatment of bulk materials and reduces energy consumption. by reducing the longitudinal mixing of the material. For this purpose, in the vertical shaft 1 there are placed along the riverbed of the shell 3 in the form of a truncated cone, and between them tangentially installed nozzles 2 for supplying the coolant with the formation of alternating rows of nozzle-shell along the material. The coolant flowing through the nozzles 2, forms a swirling flow of the gas suspension material coming from above. The nozzles 2 are located below the smaller base of each shell 3 at a certain distance, which ensures the suppression of the longitudinal mixing of the material. In this case, in each cavity formed by adjacent shells 3, a mixing mode is established, and between adjacent cavities, a mode of material displacement. 2 Il.

Description

figure 1

The invention relates to a drying technique and can be used in the chemical, metallurgical and other industries of the industry for the heat treatment of sy-. putih materials.5

The purpose of the invention is to reduce energy consumption by reducing the longitudinal mixing of the material.

Figure 1 shows the dryer section; in figure 2-cut AA

The dryer contains a vertical cylindrical shaft 1 with nozzle holes 2 and a shell 3, made in the form of a truncated cone, an annular gas distribution manifold 4, covering the shaft 1 on the outside, separator zone 5 with a material loading device 6 and a coolant outlet 7. Under the shaft is a device 8 unloading material.20

The dryer works as follows.

Through the loading device 6 and the separation zone 5, the material enters the upper section of the shaft 1, poured from the shell 3 to the flue gas streams flowing from the nozzle openings 2. The jets disperse the solid particles, twisting the gas-weighted flow relative to central axis. Due to the high velocity of the particles relative to the main mass 30 of gas coming from the lower section, they are heated by this gas flowing out of the nozzles and flow down. The cooled heat carrier rises into the separation zone 5 where it is separated from the dust and released 35 through the nozzle 7.

In the downstream section, the particles of the product, scattering from the next eye 3, are again accelerated by jets emanating from the next row of nozzles 2. Heat is exchanged between the gas entering from the bottom and the material, i.e. the process is repeated.

Thus, the section operates as a mixing apparatus, and a counter-current movement is established between the sections. 45 The flue gases from the collector 4 are distributed through the nozzle holes 2 and flow out of the latter at high speed, which ensures an intensive heat and mass transfer process.

Thus, the alternation of the QO-plate series allows one to reduce the energy consumption by more fully utilizing the thermal potential of the heat transfer medium while suppressing the longitudinal mixing of the material between the cavities formed by adjacent shells 3.

The distance from the lower edge of each shell 3 to the nozzle row h is determined by the formula

h R- tg COS / 3 +

+ r.) 2.sin2 / r

where R is the radius of the mine, m;

g - the radius of the smaller base of the shell

3m;

a is the angle of the jet flowing from the nozzles 2;

/ - the angle between the axis of the chordally directed nozzle 2 and the diametric axis of the shaft 1.

Claims (1)

Claims of the Invention loading and unloading of the material, characterized in that, in order to reduce energy consumption by reducing the longitudinal mixing of the material, it is provided with additional shell E arranged between the rows of nozzles to form during the movement of the heat transfer fluid alternated p nozzle rows - shroud. Aa FIG. 2